Topic
Cassegrain antenna
About: Cassegrain antenna is a research topic. Over the lifetime, 3207 publications have been published within this topic receiving 28278 citations.
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Patent•
03 Aug 1972
TL;DR: In this article, a microwave antenna consists of two toroidal reflectors turning their concave sides toward a common axis of rotation, i.e., a main reflector farther from that axis and an ancillary reflector closer thereto.
Abstract: A microwave antenna consists of two toroidal reflectors turning their concave sides toward a common axis of rotation, i.e., a main reflector farther from that axis and an ancillary reflector closer thereto. The main reflector has a parabolic generatrix with a focal point situated on a point between the axis and the vertex of the ancillary reflector in a common equatorial plane of the two reflectors; the ancillary reflector has a hyperbolic generatrix whose foci substantially coincide with the focal point and with the vertex of the parabolic generatrix.
20 citations
Patent•
22 Aug 2012TL;DR: In this article, an antenna method and arrangement of co-located antennas for wireless communication, including at least one first antenna having a reflector panel and a second antenna utilizing a ground plane, is presented.
Abstract: An antenna method and arrangement of co-located antennas for wireless communication, includes at least one first antenna having a reflector panel and at least one second antenna utilizing a ground plane, wherein the reflector panel and the ground plane are the same element of the arrangement. The first antenna can be a loop element parallel to the reflector panel and the second antenna can be a monopole element perpendicular to the reflector panel/ground plane.
20 citations
08 Jul 2012
TL;DR: In this article, a novel reflector antenna for near-field millimeter-wave imaging applications has been developed, combining parabolic curvature in one plane with elliptical curvatures in the other, which generates a "blade beam" focusing radiated field at a line.
Abstract: A novel reflector antenna for nearfield millimeter-wave imaging applications has been developed. Combining parabolic curvature in one plane with elliptical curvature in the other, this antenna generates a “blade beam” focusing radiated field at a line. When excited at its focal point, transmitted rays are collimated in the first (horizontal) plane, each passing through the focal line at the second ellipse focus. As such, they illuminate a narrow slice of an object to be imaged. With only this slice illuminated, the scattered field will only be due to this narrow portion of the object, allowing for computationally simple inversion of a one-dimensional contour rather than an entire two-dimensional surface. Stacking the reconstructed contours for various horizontal positions provides the full object image.
20 citations
11 Oct 2012
TL;DR: In this paper, the design methodology of the MeerKAT L-band feed which consists of a wide flare angle axially corrugated conical horn, a horn matching section and a compact orthomode transducer (OMT) is presented.
Abstract: The design methodology of the MeerKAT L-band feed which consists of a wide flare angle axially corrugated conical horn, a horn matching section and a compact orthomode transducer (OMT) is presented. The dish is a classical Gregorian offset dual-reflector antenna system. The predicted results show stable radiation patterns over the frequency band with an ideal antenna efficiency above 73 %. The feed has losses below 0.05 dB resulting in very good system sensitivity.
20 citations
TL;DR: The conical quad-ridge horn with an elliptically shaped sidewall showed the most promise as a wideband reflector antenna feed in this paper, and the radiation patterns were rotationally symmetric, and the 10dB beamwidth was reasonably constant over a wide frequency range.
Abstract: Quad-ridge horn antennas of various geometries are considered as possible candidates for a wideband reflector antenna feed. It is demonstrated that shaping the sidewalls of the ridge horns significantly improves the radiation characteristics of the horns. The conical quad-ridge horn with an elliptically shaped sidewall shows the most promise as a wideband reflector antenna feed. The radiation patterns are rotationally symmetric, and the 10-dB beamwidth is reasonably constant over a wide frequency range.
20 citations